SamyGO

I've aTv Samsung (UE40JU6500), the wifi doesn't work with my router a tp-link. The router works great with every devices but not with my tv. I've try everything: change dns,change local ip. But nothing: sometimes the tv isn't connected to the router, sometimes is connected to it but not to internet; sometimes the connection works but just for few minutes. If i connected to a iphone's hotspot works.
Advices? I've got a question: what's the server that tv try to connect? I want to see if it is available on my pc...

Try different wireless channel

tried this soluyion but never

I have a question:is possible a firmware downgrade after eabout a month ago the tv worked. i don't know: maybe Samsung's derver isn't available on my line. :(